Duplex sheath for dental handpieces



July 27 1926. 1,593,733

w. J. TERRY DUPLEX SHEATH FOR DENTAL HANDPIECES Filed July 2. 1924 /5 Hf l 7 Patented July 27, 1926.

UNITED STATES WALTER J'. TERRY, OF SEATTLE, WASHXNGTON.

DUPLEX SI-IEATH FOR :DENTAL HANIDPIECES.

Application filed July 2',

The invention is a sheath for dental handpieces which is made with a removable sleeve or cover.

The object of the invention is to provide a means for cleaning the sheath oi handpieces which will make it possible to sterilize it in the same sterilizing solution that other parts or instruments are being sterilized in without polluting the solution with grease.

Another object of the invention is to provide a removable cover for the sheath olf dental handpieces which is practically of the same design as the sheath.

And a further object ot the invention is to provide a thin removable cover for dental handpiece sheathes which is grooved to correspond with other grooves in thesheath so that it will rotate with it.

And a still further object of the invention is to provide a means for making dental handpieces sanitary, which will stop the flow of bacteria. into the interior. v

With these ends in view the invention embodies the providing of a sheath with a thin removable cover, said cover being readily attached to or removed from the sheath and having its lower en'd tapered similar to that of the sheath so that an angular or other attachment may readily be attached to either the cover or sheath.

Other features and advantages of the invention will be seen from the following description taken in connection with the drawings, wherein Figure 1 is a view of the cover showing part broken away to show the sheath.

Figure 2 is a side view of the cover.

Figure 3 is a side view of the cover showing an alternate design.

Figure 4 is a side view showing a special cover which may be used tor holding the right angle attachment,

Figure 5 is a side view showing an angular attachment in dotted lines on the end of the sheath.

In the drawings I have shown my device as it would be constructed wherein numeral 1 indicates the sheath which may be held to the head of the device as shown or to any straight handpiece by a nut 2 which will engage a collar 8 at its upper end and which may be made to hold a spindle which l have indicated by the numeral 4. The lower end of the sheath 1 is provided with a beveled surface 5 which extends from the point 6 1924. serial no. ceases.

to the point and then a section 8 with a slight taper which extends from the point 7 to the point 9 shown in Figure 1. Frein the point 9 to the point 10 the sheath is grooved and above the point 10 are threads 11 which hold the outer sleeve or cover 12.

The cover 12, which is shown in Figure 2,

is provided with a swivel joint at the point 13 and alinurled section 14 in the inner side ot which are threads 15 that screw on the threaded section 11 and above this lnurled section 14 is a thin sleeve 16 which engages the upper part of the sheath. The lower section of the cover 12 is also provided with a tapering section 17. to correspond with the section 5 of the sheath, and above this beveled surface is another tapering section 18 which corresponds with the tapered section 8 of the sheath. Above the section 18 is a straight section 19. y

A pin 20 upon which the angular `or other attachments may beheld projects :from the side ot the section 18. Between the section 19 and the swivel joint 13 are grooves 21 which correspond with the grooves in the sheath and these grooves are of such a size that their inwardly projecting portions will entend into the grooves in the sheath and thereby cause the cover and sheath to rotate or be held together. lt `will be seen that as the upperend ot the cover 12 is screwed onto the sheath the tapering sections atthe lower end will bind against similar sections at the lower end of the sheath.

ln Figure 3 I have shown an alternate design in which the entire cover which I have indicated bythe numeral 22 is made in one piece without the swived joint. The grooves are omitted so that the cover may be screwed upon the threads 11 and it will be seen that the tapering sections 17 and 18 will rigidly hold the cover to the sheath.

In Figure 4 l have shown another alternate design in which a right angle attachment 23 is attached to the lower end of the cover at the point 24. In this design the tapering section 17 is on the inside of the sleeve 25 and the section 26 above this section is knurled to provide a gripping surtace. Above this .section is a grooved section 27 in which the grooves are similar to the grooves 21 in the cover 12 so that they may be placed over grooves on the sheath. The upper end of the cover shown in Fig ure 4 which I have indicated by the numeral 28 is provided with a short sleeve 2) which :fits snugly over the straight section below the threads 111 on the sheath land it will be seen that this section andthe tapering section in the .sleeue will hold the device upon the sheath. However, it is understood that the upper :end feit `Lthe :sleeve 28 may he provided with a section 16 similar to that shown in FigureQfin whichit'hissection is connected to the lower part of the :sleevehy a swivel Vljint,or as shown inFi'glure f3, in `which 'this `section is attached to thesleeve with'the grooves vvomitted.

In Al-Fi'gure 5 I Yhave Yshown 'an iexternail Yview of `the sheath showing an 'angular yattachment in Ydotted "lines as fit vWould appear when nplaced "over the 'end of the sheath. It is 'understood that this r'angular attachinent may v'either he jplaced'over the fend *of "the'sheath'or cover fas maybe desired.

It will lloe v:understood 'that :changes may 'bemade in the `construction withoutdepart- Ling from'the spirit of :the invention. @ne of which changes may he inthe 'design 'off the;s`heath or cover; .ano'th-ermagy Ehe in *the means :for fholding the sheath vto vfthe cover; ,and still 'another may oe in the prioviding *of similar attachments, similar ito the device 'shown in `Figure .4, V:for ihdlding 'other at tachments vto the cover. p

The lconstruction `will :readily ihe understood 'from l'the zfttoregoing description. To

' use the 'device it will .he seenthatxthehandpiece inayifhe' used with for'withoutthe rover, however, when `the cover :is `'used it 'may freadily :he attached 'hy plac'nig fit 'over Vthe .sheath and screwing `the section i6 upon the threads '1"1. It will `alsoloe ohservedthat several oi" these 'covers or isleeves may =he used with one handpiece 'as :one `'many i be "used while the other fis Nbeing 'cleaned 'To "olea-n the cover it 'may readily -he :removed -by unscrewing the sleeve '16. It will also he ohserved that aburr or other tool may be insertedthroughitheeendaof the sleeve or cover and also through the sheath into the end of 'the spindle, vand .asithe angular or other attachment are also provided with a shank fsimilarto the 4'shank of the burr, they may he held over the cover in a similar manner. It 'will loeseenthat a felt'washer or packing 3C vmay he lplacedbetweenfthe lower end lor tip of the sheath and the shoulder on the inner side of the :tip vofthe-'cover 'l2 is tostop the lhow ofsaliva into the inside of the instrument.

Having thus 4fully 1 described 'the invention, lwhat 'I `claim las Snew fand desire yto .secure 7by Letters Patent, :is

1. A sheath for dental handpieces having a removable cover, ysaid sheath having` rgrooves in its fouter surface to correspond with similar :grooves in 'the cover and threads upon which 'the cover may he screwed.

2. A Icover for y:dental h'andpiece sheaths -having threads by which it 'is screwed-onthe sheath, fand grooves 'corresponding with grooves on the sheath "to prevent its turning on the sheath, isaid cover 'providing ,means fatfthe tip iwh'erehy a 'washerfrnay he inserted to prevent fthe 'ffl'ow of saliva linto the instrument.

lA fcover for dental handpiece .shea'ths havin-g threads 'by which it is screwed on .the tsheath, and grooves `correspending with grooves on "the 4sheath lfor `preventing its .turning 'onfthe rsheath, said cover having a space between 'its :end land ythe end of `the Vsheath .inwhich 'a washer may be inserted. WALTER jJ. TERRY. 

